BCM Power Supply and Ground Circuit Check

WARNING: This page is about a different car, the 2005 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FUSE AND FUSIBLE LINK
- Check 10A fuse (No. 4, located in the fuse block (J/B)]
- Check 10A fuse (No. 59, located in the fuse and relay box)
- Check 50A fusible link (letter f located in the fuse and fusible link box)
NOTE: Refer to "COMPONENT PARTS AND HARNESS CONNECTOR LOCATION ".

OK or NG
1. OK: GO TO 2.
2. NG: If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse. Refer to "PRECAUTIONS ".
CHECK POWER SUPPLY CIRCUIT
1. Turn ignition switch ON.
2. Check voltage between BCM connector M18, M20 terminals 38, 70 and ground.
  1. 38 (W/L) - Ground: Battery voltage
  2. 70 (W/B) - Ground: Battery voltage
OK or NG
1. OK: GO TO 3.
2. NG: Repair or replace harness.
Fig 1: Checking Voltage Between BCM Connector M18, M20 Terminals 38, 70 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BCM.
3. Check continuity between BCM connector M20 terminal 67 and ground.
  1. 67 (B) - Ground: Continuity should exist.
OK or NG
1. OK: Power supply and ground circuit is OK.
2. NG: Repair or replace harness.
Fig 2: Checking Continuity Between BCM Connector M20 Terminal 67 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.